COLORADO SPRINGS, Colo. – Harrison High School was placed on lockout Wednesday morning after staff members found a magazine with live ammunition.

In a letter to parents, Harrison School District Two said as soon as the magazine was found they conducted an investigation. Students and staff were searched as well as a thorough search of the premises. The district reports that a weapon wasn’t found. They continued to say, at no time were students and staff in danger.

A source from the school told KRDO while the lockout was in place that it was precautionary and that students were going about their normal business.

The source also told KRDO that were rumors about a gun found on campus, and that the rumors were unsubstantiated. They continued to say that’s “not quite what caused the lockout.”

One parent told KRDO students were having their backpacks searched in class, but it wasn’t clear what they’re looking for.

Harrison High School students were released at 1 p.m. The school will be back to regular scheduling Thursday, with increased security for the remainder of the week.